1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.42-2.523.65-4.55
1
7.18
1.5 Fracture
Irregular/uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
ConchoidalArthur Thomas, Gemstones (2009)
1.6 Cleavage
Perfect on {10 1 0}, poor on {0001}
None, but may exhibit slight parting
1.7 Mohs Hardness
1.8 Chemical Composition
Na 2Ca 2Al 6Si 6O 24(CO 3) 2Walter Schumann , Gemstones of the world (2001) More from other references
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)